วันแรก
ข้อ 17 ตอบ 4
1 + 2 + ... + 2547 บ 1 + 2 + ( 3+2547) + ... + ( 1274+1276) + 1275 (mod25)
บ 1+2 (mod25)
บ 1+2(mod25)
บ 4(mod25)
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I love the sky !!!
It's never boring.
When I don't want to see it, I don't have to.
And when I want to, I can see it from anywhere.
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